Loop spreader for sewing machines



Jan, 6, 1931. R. BECKER LOOP SPREADER FOR SEWING MACHINES Filed Dec. 14,1928 y 2 Sheets-Sheet 1 Jan. 6, 1931. R BECKER I 1,788,008-

LOOP SPREADER FOR SEWING MACHINES I Filed DSC 14. 1928 2 Sheets-Sheet 2y en inverted y\shaped r'loop-sp'reading por-ly tion which ispreiterably"disposed between kthe needlesawith its point',extending in the iPtentecl Jen. .193,1` f

MANUFAC'JIUItime'k ooi/iPAnY'j, jon ELIZABETH, tfivnw"JERSEY, ALCORPQRATON oF NEW JERSEY] igloo?" srnnnnizn 111012,` snvviiie MAoinNnsg f "Applicaties-"medDecember 14, i928. I sawing; 326,132.

i This invention relates to sewing machines,

. more particularly Vlof the: straw-braid sewing Y, eyeepointe'd needlesbelow the throat-plate', -and hes for type .having hookV and disposeden'l object to'finiprove the: stitch-forming mechanism offelinachineoi!tliisptype so that will not skip stitches under thevaryingf sewing conditions zinet Lwithfin practice.'

More speeiiically,. the. invention` hasV `for Fan 10V object toirnprovenisin'` sdthzit I`irregular" seenis-v. or j, curved seamsofshortgradins'l inziy `be'sevvn ivithout skippedk stitches. gf: r, yt'lo the attainment 'oftlieends in view,

work@eitvvhich` the vneedles ereinounted, e loop-spreader 'adapted toenterftheihreed- .loop on the hook-'needle'v :indyspr'eaid such f loopfor certainV entry by" 'theeye-pointed needle; fyflreferably, they`loop-spreedern` has `direction .of reciproca-tion.ofv said 'needles.

Y spreader that it maybe moved the direction of reclprocatlon `of fthe`-needles;. vjmoveinent' being such as to cause.- ythe spreadertov risewith andsoinewhet faster than `the :thread-loop fon he hook-needlel sindserving additionally to `preventprematurefsheddin g `of thevloop byythe'hooksneedle Whenthe spreading' of. the loophesbee'n accomplished,the ,spreader v tinue fth'eir upward motion;

book-needle shedding-y su'eh loop" Which is tigliitencd in the usualmanner. 1;

the fstitcheforming frnechm there-'visprovidednonthe ,sainel side-ofthev It is yalso preferredto 'so mount f Athe loopnv Vthe needles,therebyentering, and spreedingthe `bythe eye-pointed "It isifurtl'leipreferred toprovidc theuni-v braid. sewing..machinei einbodying theinvention; the needles and loopspreader being et thelowerkliniits oftheir respective strokes.

Fig; 2 is a 'ragnientziry*front elevation ofV` 55. i

A'thefinetclnne` with the parts vin the same rela.- lltiie positionsshown inFig..1. Figs. 3f andV tzireviews similar to Figs.4 lfftndlQ,respec- '-tiv.ely, .with the needlesrisingv and the Yloopf spree-identitits. position fofdivell et. the` i1p-lk perliinit oitsstrokeli' Fig. 5is a, disassembled perspective :v'ie\v"y of the loopspreaderendits-carrier. Fig. 6 is a bottoni '.vieW' ofthe bed-cfover-plate onAWhich the loop-spreader is -pivotelly mounted. Figs.

-7, 8 and 9 are, respectively, side,.ront and j top-plan views k'of theyneedles endspreader at .theperiod oflthe cycle When theneedlepol-nts`have descended clear of the Work Vandthe lfeed 'ofthe Workhasvvcominenced.

Figs-10, llendflfere vieivs siniilzirfto Figs. `7, 8f and 9,respectively,

` Wit-h the needles and spreader ell the gway; down andthe eedfof ftheyWork ycontinuing thev spreader point' being: streddledby the"thread-loopV on: the

l .Figsl 13,14 andf15 are similarv j' views With` the needles risingand,UV the Yspreader et'therupperlimitV of its'stroke; the ythreajdloopbeing :the hook-needle and fully spread for' entry` needle. Fig: 16 isa; plan hook-needle view of lie-.loop-spreder andits carrier-finlits..relation `W1th theI `needles :indthroatplete ofthe 1nacliine`,e1idl'isie Vper.- loop-spreader removed from itsjcarrier. j

-For Vthe purpose of thepresent disclosure.

tlielinventionis shown as embodied in :L sewlinginachine havingsubstantially theoonstructive features set forth iu the patent toRQBeckeiyNo. 1,429,399y of' Sept-19, 1922. Such zi machine con'ipriscs nbed l,'overhn.ng inghead 2,presser-foot 3',- Jfeed-dog et,bedcover-.plete 5,

'needle-bar'heving et its upper end the offset held in the'bzirb ofandthroatplate 6.y SlideblyY V nioiuitedingthe bedlV is thereciprocating head 8 carrying the eye-pointed needle'Q and hoolz-needle10, with which the'loopers 1'1, l2

cooperate inthe usual manner toY form stitches.,` A i er# Theneedle-baris actuated-by the link-conl lo cussion thereof is :deemedunnecessary. Y .In the operation ofa sewing machine of the needles varenection 13 with the slide-block 14 embraced in the fork oftheleverlfulcrumed at 16 Y is given rocking. VYmovements by the pitman 17which embraces on the bed 1. The lever the-eccentric 18 on themain-shaft 19. The

, position of the slide-bloclrlt in thev fork of the lever 15 iscontrolled bythethickness of the work underthe presser-footent referredto, whereby the needlesQ, 1()` are caused to' rise to a constant heightabove the` upper surface of the work, regardless ofy variations inwork-thickness. As Vthe 'forergoing features are commento.,sewing-unaohines of the straw-braid type and are well known to tl'iofseskilled intheart, further. disthe 4type in question, -when Y Y above the work, thelooper-mechanlsm seizes a thread-loopfrom the eye-pointed needle 9` anddeposits it inthe barb ofthe hook-needle ot' this 'Y 10: hen Ythevneedles desoenchthe. hookneedle. draws thisfthread-loop down throughthe work. When the work is'V fed, thelimbs thread-loop are- 'carried'rearwardly over the eye-pointed needle which enterssuchsince suchmovement ofA .-21 transverse that when thelimbs of the thread-loop ontheloop'in its next ascent. The thread-triangle formed.` bythe loopen thehook-needle has a very shortl base, constituted 'by *ofv the loop' lyinginthe barbA of the'fhoo'lz- `f'needle,a1id long sloping sidesleadinglfrom `the base ata rearward and upward slantto the4 last stitch.the loop` which is determined sol'elyfbyfV the width of .the barb' ofthey hook-needle, is so narrowthatthere is danger that suoh loop-willnotbe enteredby the eye-*pointed needle, thus resultingin a'skippedstitch. The danger is greatlyincreased in sewing irregular or curvedseams orwhe-never, 1n the feed of the work, the last formed stitohti'sVcarried toV one side of the vertical pla-ne' of the needles, the laststitchtends to shiftthe thread-loop triangle to one side of y.the pathlof the eye-pointedneedle.

To avoid the' dangergreferredto and make the-machine more certain in itsoperation, there is provided a loop-spreader 2O inlthe form of a flatblade having-aninverted-.V- shaped point 21 disposed between the-needlesS), 10 with the planeof the blade Y20 and .point tothe plane ofthepneedles; the

point 21 extending upwardly or. infthe same Vdirection as thel points ofthe needles. The

point 21 is disposedabove the lower limit of movement of the Vbarb ofthe hook-needle', so

hook-needle are carried yrearwardly by the feed of the work, such limbsare caused to -straddle the loop-spreader which tends to wedge saidlimbsapart and spreadlop'en the loop. Y Y

vAs the point ofthe loop-spreader is-much 'I- closer-tothe hook-needlethan is the point of byfeonv neot'ions ysuch as disolosedintheBeeker.pat-

.side of the' bed-"cover-plate 5.

theportionr y' -rollers29 on the needle-bar In other words, the Vspreadof -to the spreader-point 21.

Yshown in point 2l wi'thloop-'lifting hold-it. in thebarb of spreader anupward'movement 'early in lthe Aup-strolre`of the needles,..to in'sureafull Y,spread of ythe thread-loop atthe shorter stitch-lengths and tohold the loop in the barb ofthe hook-needle untilthe loop is safelyentered by theeye-pointed needle, thus rendering unnecessarytheiclosecontrol of q the thread-loop Aby the take-up, heretofore at-.

tainedwith difficulty. Y .Y

The Spreader-shank is adjustably mountedin thehorizontal slot 2 2carrier 23.V which is-pivotally l pin 2,4xed inthe spaced lugs 25 on theunder The pin 24 is mounted closely' below the-bed 5-'so that the lin'otionfof the loop-'spreader point 2l` will, in 'its limited rangefofmovement, be, substantially` vertical -or--in the. direction of.reciprocaj tion of the needle. 5

in theA spreader-- mounted on the The spreader-'carrier 23is formed witha vertical slot26in which isadjustablyimount--f *ed the. bar 27 havingva hook-shaped lower end 28.' `The'''bar27 extends between the spaced Khead18. Theaxes of the rollers 29 are'di'agonally spaced-so `that boththe vertical and horizontal portions -off'- the barV 27Iare engaged bymotionof the needle-bar.' The pivot 24 is well to right, Fig.' 2, .ofthe vertical planes of the axes of therol'lers 29, so that inthe earlyupward movement ofthe needle-bar, the roll-"` ers 29 swing the spreadercarrier 28vabout`its pivotj24 andi-impart an'npward Vmovement K Thismovement of the spreader-point isfaster `than the movevment oftheneedles 'and shiftsrthe spreader@ vfrom the `position shown in F l0 toVthat ig. 13, thereby fully spreading the thread-loop for entry bytheeye-needle 9.

vT `1e spreader-blade'20-:is vformed below its grooves 30,' Fig. 17,-l

whi'ch` venga-ge the spread Y'thread-loop and e the hook-needle, Fig.13,' until the loop is'safelyentered bythe eyeneedle. The 'bar 27 is soshaped that its side edges'are both Vsubstantially in engagementwith the'rollers 29 at all times.V lllhen the loop-spreader reachessubstantially'the position shown in F ig. 13, ity-dwellswhilev'theneedles'oontinue their Llp-stroke; the rollers 29"'working on the bar 27The lower: limit of motion of the spreader vertical portion of thesue-hrollers in the 27.1 maybe varied by adjusting the bar 27 i f higher orlower on the Carrier 28. The point ofthe'spreader 21 lmay be adjustedtranswith a needle-hole oi' slot ABlf'ivliicli is closed at its sidesand rear end 32, rather than open'-y iiig iiitotlie feed-dog slot' 33.Such a closed needle-slot liinits the rearward slant 'of the thread-loopon the hook-needle when theif'eed isadjiisted for tlielonger stitches.The needie-slot. 3l also limits the side shift of the thread-loop `'whenthe vlast 'stitch' is carried feed of the work in sewing `irregularseamsor curved seains of snort radius,l as shown in Fig; 16. It is to beunderstood, however, that the'closed needle-slotin the throat-plate" isnot essential to the invention in the broader aspects of thelattei'. yI- 'i The use of the spreadeiin question renders it unnecessary to setvthe needles in parallelism with such a high degree of accuracy asheretofore.y Furthermore, with thepresent spreader,'a slightlybentneedle will not Vcause the inachine to skip. 1

' Having thus set v`forth" the nature ofthe invention what vI claimherein is: v l. In a sewing machine, the combination with parallel hook`and eye-pointed needles fixed relative to one-another and disposediinlthe vertical plane ofr seam-formation, -of a loop-spreader having'a flattriangular blade disposed in a plane transverse to the plane of saidneedles and having a loop-enteringv point extending in the-same:direction as the points ofsaid needles.

2. YIn a sewlng machine,the combination with hook and `eye-pointedneedles, of a thread-loop spreader having a loop-entering point andloop-engaging shoulders at opposite sides of said point. Y i

In a sewing machine, the combination with hook andv eye-pointed needles,of a thread-loop spreader having a loop-entering point and loop-engagingshoulders atfopposite sides of saidpoint, and means for recipi'orating'said spreader in the directionjof i'ecipiocation of saidneedles.V i

4l. In, a sewing machine, the combination with feeding in echanisni, anda throat-plate having `a needle-hole elongated'in the direction otiee-d'and liavingside and` rear endY needles fixed relative toone-another, and a 'loop-spreader disposed between said needles and atthe saine side oi the throat-plate with said needles. e

5.ln a sewing machine, theV combination with reciprocating *hook andeye-pointed needles fixed relative toy one-another, 'of a with hook andeye-pointed reciprocating -`@with hook an dY eye-pointed ,fifccprocatijn needlesiixedrelative to one-another, :of-"ia" n v tread-loop spreaderi-` disposed. between said n hook 'and eye-pointedneedles j to one-another, f coinp'leinental :loopetalring 'ineansyf a niii-:edile-bar i carryii kpointed needle.

`lated portions working .needle-bar on which lmounted in relativelyfixed' relation, ofv -1115 nieans enga eine the thread-loo J on thelhookivalls, of reciprocating hook and ey/@.pomtmiv e e lj-iiitliedirection oi'niovenient` of said.L needles.

77'.- in al lsending' kinacliine`the combination im,

D'edlesgand ineans /torlnioving said 'spreader the direction etmovement-ot saidfneedles 75 n l Y 'and' faste-,ri- I1 to one side of theplane of the needles by :the

y I iansaild needles.. fln'fa seiiiir.

K said ,needleshgov iy Asaid needleandi having a-nioveinent hetween'iandin the-saine directionas ,saidneedles..n'V 9. In a sewino inachinethecombination VLwithahool; andeye-pointed"needles;'ot ineens s3 movingwith said=iieedles inyposi'tion to en- `pagev the th'read-ldop enf-thehook-needle before the needles enter the work and` hold such loop in thebarb ofthe hook-needle iintil said loopV is safelycnteredby theV4eye-,eo

10. In a sewing in'acli'ine, the combination with hook and-`eyepointedneedles, a needlebar carrying said needles, guides on said needle-barspaced apart both vertically and; 95 horizontally, a 'loop-spreadei, a fspreadercarrier, and-.an actuator-bar connected'to said Yspreader-carrier and hai/'ing angiilarly rebetwee'n said giiides,

ll. In a sewing inachine, the coinbinationnlUO with hook andeye-pointedneedles, a"needlei"" bar carryingsaid needles, guides lon saidneedle-bar yspaced apart both vertically and l horizontally, aloop-spreader, a spreadercarrier, and an actuator-bar connected tosaidfjlo spreader-carrier and having angularly-related portions workingbetween said guides, oneof said'portions being parallel with theneedle-bar when engaged by said guides. thereby producingJ a dwell inthe thelloop-spreader. y

l2.` In a sewing inachiiie, thecombination Witliliooland eye-pointedneedles,v and a both'ot said needles are Y and iii-rear` of thehook-needle rfor spreadingV thel thread-loop Von i the hook-needle forentryV by the eye-pointed needle. p e

let. In a sewing machine" of the straWf-lw Ainotion olf 1105 biaidty-peth'e Combination With a reeipolCatory needle-bar, hook` andyeye-pointed y'needles mountedA on saidneedlebarin rela-l y tively iXedrelation7 and cooperating loopen- 1 qineehanism, v'ofirineansbetweensaid needles.v for spreadingzthe: thread-loop on the hook`V'needle for lentry by the eye-pointed needle. Y

l5. In e sewing machine, in Combination, l" Aliookandeye-pointedneedles, a needle-ber yon; \vliich said needles are mountedin iel-V Y atively liXed ielatioma" tln'oatfplete5` a, loopspreader"pivola'llyY mounted closely below Y '1.1 said throat-plate :it adistance to one-sidefof said needles, said doop-spreader lifavvingiraloop-engaging portion disposed between said i i needles' and adapted tomove in the direction Vof reeiprocation of said .needlesfand means Afor`ztetn'atin lation? With `said needles.

gthe loop-Spreader in timed re- .In testimony whereof, Iiliaie signed myname to this specification.

